Precious stone



FIG. 1 is a perspective view of a precious stone showing my new design;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a side view of FIG. 1, all other side views being symmetrical; and,

FIG. 4 is a bottom view of FIG. 1. 

CLAIM The ornamental design for a precious stone, as shown and described. 